Abstract:Objective: To compare two different guidance techniques,X-ray before and CT during the chemonucleolysis for treatment of lumbar disc herniation.Methods: One hundred and six patients(54 female and 52 male),diagnosed as the lumbar disc herniation by CT or MRI,were devided into two groups.One received X-ray examination as the guidance before the injection;the other underwent the chemonucleolysis under CT guidance.In these two groups,the outcomes were compared postoperation from 7 to 300 days.Results: It's harder to reach the proper area in the X-ray guidance group than that in CT-guidance group.Excellent and good rates in the CT-guidance group(68.97%) were better than the X-ray guidance group(38.67%,P<0.01) at 30~(th) day' follow-up.Conclusion: Chemonucleolysis can be succesfully performed with the CT-guidance;the long-term analgesic effects are better than X-ray guidance.